Controlling an Indicator at a Rear Car of a Train Based on a Control Signal from a Lead Car

ABSTRACT

A device for attachment to a train having a lead locomotive or control car and a rear car may include an indicator disposed with the rear car. A communication interface may receive at least one control signal from an interface onboard the lead locomotive or control car, and the control signal(s) may be generated based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input. A controller may be coupled to the indicator and the communication interface and may change a state of the indicator based on the control signal(s). Systems and methods for controlling an indicator are also disclosed.

BACKGROUND 1. Field

This disclosure relates generally to systems, devices, products, apparatuses, and methods that are used for controlling an indicator at a rear car of a rail vehicle and, in some particular embodiments, to a system, product, and method for controlling an indicator at a rear car of a rail vehicle based on a control signal from a lead car.

2. Technical Considerations

Certain rail vehicles (e.g., trains, locomotives, railroad cars, passenger cars, coaches, freight cars, wagons, and/or the like) may include an end of train (EOT) device, e.g., on the trailing coupler of a last car of the rail vehicle. An EOT device may include with a high visibility marker (HVM), e.g., a light. The HVM may visually indicate the rear of the rail vehicle. For example, the HVM may be constantly on or continuously flashing. Additionally or alternatively, the EOT may include a light sensor to sense ambient light and may switch the HVM on if ambient light drops below a threshold (e.g., remains below the threshold for a period of time). As such, the HVM may be autonomous, e.g., independent of external control.

However, it may be difficult to control the HVM. For example, the operator of a rail vehicle (e.g., at the front of a train), crew members, or other individuals or computer systems directly or indirectly controlling the rail vehicle may be unable to control the HVM. Additionally, such lack of control may reduce flexibility in using the HVM in certain conditions. For example, the HVM may not be able to be controlled in response to environmental conditions, hazardous conditions, type of cargo (e.g., hazardous cargo), time and location of the train, triggers from control systems, or input from the operator. Additionally, applicable laws and/or regulations may require an HVM to be on in certain circumstances and/or flashing in a particular pattern with a particular color of light. Such laws/regulations may further reduce flexibility in using the HVM in certain conditions.

SUMMARY

Accordingly, systems, devices, products, apparatuses, and/or methods for controlling an indicator at a rear car of a rail vehicle are disclosed that overcome some or all of the aforementioned deficiencies.

According to non-limiting embodiments, provided is a device for attachment to a train having a lead locomotive or control car and a rear car. The device may include an indicator disposed with the rear car. A communication interface may be configured to receive at least one control signal from an interface onboard the lead locomotive or control car. For example, the control signal(s) may be generated based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input. A controller may be coupled to the indicator and the communication interface. The controller may be configured to change a state of the indicator based on the at least one control signal.

In some non-limiting embodiments, the indicator may include a light source. For example, the light source may include at least one of an illumination fixture, a light emitting assembly, a light bulb, a light emitting diode, a laser, an infrared light source, an ultraviolet light source, a visible light source, any combination thereof, and/or the like. In some non-limiting embodiments, the indicator may include a high visibility marker (HVM) of an end of train (EOT) device (e.g., coupled to a trailing coupler of the rear car). Additionally or alternatively, the indicator may include a light source separate from the HVM of the EOT device, which may be coupled to the trailing coupler of the rear car. For example, the indicator may be removably connected to the EOT device. In some non-limiting embodiments, an indicator may be disposed proximate to a trailing end of the rear car.

In some non-limiting embodiments, the interface may include at least one of an operator interface, a head of train (HOT) device, a PTC device, or an ETMS device. In some non-limiting embodiments, the interface may be configured to receive the control signal(s) from a remote server. Additionally or alternatively, the interface may be configured to generate the control signal(s) based on at least one sensor signal from at least one sensor. For example, the sensor(s) may include at least one of a speed sensor, a location sensor, or a clock. In some non-limiting embodiments, the control signal(s) may include at least one first control signal from the sensor(s) and at least one second signal from at least one of an operator interface, a HOT device, a PTC device, or an ETMS device. Additionally or alternatively, the controller may be configured to override the first control signal(s) in response to the second control signal(s).

In some non-limiting embodiments, the interface may be configured to display an indication of the state of the indicator. In some non-limiting embodiments, the state may include at least one of an off state or an on state. Additionally or alternatively, the state of the indicator may include one of a plurality of possible states, and each of the plurality of possible states may be associated with at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a PTC, an ETMS, an authorized trigger, or a manual input.

In some non-limiting embodiments, the control signal(s) may include at least one of a digital signal or an analog signal. Additionally or alternatively, the control signal(s) may include an interruption in an electrical signal (e.g., a digital or analog signal).

In some non-limiting embodiments, the communication interfaces may include at least one of a wired interface or a wireless interface.

In some non-limiting embodiments, a camera may be disposed proximate to the indicator. Additionally or alternatively, the state of the indicator may be changed to an enhanced brightness state to illuminate at least part of a viewing area of the camera.

According to non-limiting embodiments, provided is an indicator control system for a train having a lead locomotive or control car and a rear car. The indicator control system may include an interface onboard the at least one locomotive or control car. The interface may be configured to transmit at least one control signal based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a PTC, an ETMS, an authorized trigger, a manual input, any combination thereof, and/or the like. A device for attachment to the train may include an indicator disposed with the rear car. A controller may be coupled to the indicator. The controller may be configured to receive the control signal(s) from the interface and to change a state of the indicator based on the control signal(s).

According to non-limiting embodiments, provided is a method for indicator control for a train having a lead locomotive or control car and a rear car. The method may include transmitting at least one control signal, which may be based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a PTC, an ETMS, an authorized trigger, a manual input, any combination thereof, and/or the like. The control signal(s) may be received at a device attached to the train. The device may include an indicator disposed with the rear car. A state of the indicator of the device may be changed based on the control signal(s).

Further embodiments or aspects are set forth in the following numbered clauses:

Clause 1: A device for attachment to a train having a lead locomotive or control car and a rear car, comprising: an indicator disposed with the rear car; a communication interface configured to receive at least one control signal from an interface onboard the lead locomotive or control car, wherein the at least one control signal is generated based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input; and a controller coupled to the indicator and the communication interface, the controller configured to change a state of the indicator based on the at least one control signal.

Clause 2: The device of clause 1, wherein the indicator comprises a light source.

Clause 3: The device of one of clauses 1 or 2, wherein the light source comprises at least one of an illumination fixture, a light emitting assembly, a light bulb, a light emitting diode, a laser, an infrared light source, an ultraviolet light source, or a visible light source.

Clause 4: The device of any one of the preceding clauses, wherein the indicator comprises a high visibility marker (HVM) of an end of train (EOT) device.

Clause 5: The device of any one of the preceding clauses, wherein the indicator comprises a light source separate from the HVM of the EOT device coupled to a trailing coupler of the rear car.

Clause 6: The device of any one of the preceding clauses, wherein the indicator is removably connected to the EOT device.

Clause 7: The device of any one of the preceding clauses, wherein the indicator is disposed proximate to a trailing end of the rear car.

Clause 8: The device of any one of the preceding clauses, wherein the interface comprises at least one of an operator interface, a head of train (HOT) device, a PTC device, or an ETMS device.

Clause 9: The device of any one of the preceding clauses, wherein the interface is configured to receive the at least one control signal from a remote server.

Clause 10: The device of any one of the preceding clauses, wherein the interface is configured to generate the at least one control signal based on at least one sensor signal from at least one sensor.

Clause 11: The device of any one of the preceding clauses, wherein the at least one sensor comprises at least one of a speed sensor, a location sensor, or a clock.

Clause 12: The device of any one of the preceding clauses, wherein the at least one control signal comprises at least one first control signal from the at least one sensor and at least one second signal from at least one of an operator interface, the HOT device, the PTC device, or the ETMS device, wherein the controller is configured to override the at least one first control signal in response to the at least one second control signal.

Clause 13: The device of any one of the preceding clauses, wherein the interface is configured to display an indication of the state of the indicator.

Clause 14: The device of any one of the preceding clauses, wherein the at least one control signal comprises an interruption in an electrical signal.

Clause 15: The device of any one of the preceding clauses, wherein the at least one control signal comprises at least one of a digital signal or an analog signal.

Clause 16: The device of any one of the preceding clauses, wherein the communication interfaces comprises at least one of a wired interface or a wireless interface.

Clause 17: The device of any one of the preceding clauses, wherein the state comprises at least one of an off state or an on state.

Clause 18: The device of any one of the preceding clauses, wherein the state of the indicator comprises one of a plurality of possible states, each of the plurality of possible states associated with at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input.

Clause 19: The device of any one of the preceding clauses, further comprising a camera disposed proximate to the indicator, wherein the state is changed to an enhanced brightness state to illuminate at least part of a viewing area of the camera.

Clause 20: An indicator control system for a train having a lead locomotive or control car and a rear car, comprising: an interface onboard the at least one locomotive or control car, the interface configured to transmit at least one control signal based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input; a device for attachment to the train, the device comprising: an indicator disposed with the rear car; and a controller coupled to the indicator, the controller configured to receive the at least one control signal from the interface and to change a state of the indicator based on the at least one control signal.

Clause 21: The indicator control system of clause 20, wherein the indicator comprises a light source.

Clause 22: The indicator control system of one of clauses 20 or 21, wherein the light source comprises at least one of an illumination fixture, a light emitting assembly, a light bulb, a light emitting diode, a laser, an infrared light source, an ultraviolet light source, or a visible light source.

Clause 23: The indicator control system of any one of clauses 20-22, wherein the indicator comprises a high visibility marker (HVM) of an end of train (EOT) device.

Clause 24: The indicator control system of any one of clauses 20-23, wherein the indicator comprises a light source separate from the HVM of the EOT device coupled to a trailing coupler of the rear car.

Clause 25: The indicator control system of any one of clauses 20-24, wherein the indicator is removably connected to the EOT device.

Clause 26: The indicator control system of any one of clauses 20-25, wherein the indicator is disposed proximate to a trailing end of the rear car.

Clause 27: The indicator control system of any one of clauses 20-26, wherein the interface comprises at least one of an operator interface, a head of train (HOT) device, a PTC device, or an ETMS device.

Clause 28: The indicator control system of any one of clauses 20-27, wherein the interface is configured to receive the at least one control signal from a remote server.

Clause 29: The indicator control system of any one of clauses 20-28, wherein the interface is configured to generate the at least one control signal based on at least one sensor signal from at least one sensor.

Clause 30: The indicator control system of any one of clauses 20-29, wherein the at least one sensor comprises at least one of a speed sensor, a location sensor, or a clock.

Clause 31: The indicator control system of any one of clauses 20-30, wherein the at least one control signal comprises at least one first control signal from the at least one sensor and at least one second signal from at least one of an operator interface, a HOT device, a PTC device, or an ETMS device, wherein the controller is configured to override the at least one first control signal in response to the at least one second control signal.

Clause 32: The indicator control system of any one of clauses 20-31, wherein the interface is configured to display an indication of the state of the indicator.

Clause 33: The indicator control system of any one of clauses 20-32, wherein the at least one control signal comprises an interruption in an electrical signal.

Clause 34: The indicator control system of any one of clauses 20-33, wherein the at least one control signal comprises at least one of a digital signal or an analog signal.

Clause 35: The indicator control system of any one of clauses 20-34, wherein the communication interfaces comprises at least one of a wired interface or a wireless interface.

Clause 36: The indicator control system of any one of clauses 20-35, wherein the state comprises at least one of an off state or an on state.

Clause 37: The indicator control system of any one of clauses 20-36, wherein the state of the indicator comprises one of a plurality of possible states, each of the plurality of possible states associated with at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a PTC, an ETMS, an authorized trigger, or a manual input.

Clause 38: The indicator control system of any one of clauses 20-37, further comprising a camera disposed proximate to the indicator, wherein the state is changed to an enhanced brightness state to illuminate at least part of a viewing area of the camera.

Clause 39: A method for indicator control for a train having a lead locomotive or control car and a rear car, comprising: transmitting at least one control signal based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input; receiving the at least one control signal at a device attached to the train, wherein the device comprises an indicator disposed with the rear car; and changing a state of the indicator of the device based on the at least one control signal.

Clause 40: The method of clause 39, wherein the indicator comprises a light source.

Clause 41: The method of one of clauses 39 or 40, wherein the light source comprises at least one of an illumination fixture, a light emitting assembly, a light bulb, a light emitting diode, a laser, an infrared light source, an ultraviolet light source, or a visible light source.

Clause 42: The method of any one of clauses 39-41, wherein the indicator comprises a high visibility marker (HVM) of an end of train (EOT) device.

Clause 43: The method of any one of clauses 39-42, wherein the indicator comprises a light source separate from the HVM of the EOT device coupled to a trailing coupler of the rear car.

Clause 44: The method of any one of clauses 39-43, wherein the indicator is removably connected to the EOT device.

Clause 45: The method of any one of clauses 39-44, wherein the indicator is disposed proximate a trailing end of the rear car.

Clause 46: The method of any one of clauses 39-45, wherein transmitting the at least one control signal comprises transmitting the at least one control signal from an interface onboard the lead locomotive or control car, and wherein the interface comprises at least one of an operator interface, a head of train (HOT) device, a PTC device, or an ETMS device.

Clause 47: The method of any one of clauses 39-46, wherein the interface is configured to receive the at least one control signal from a remote server.

Clause 48: The method of any one of clauses 39-47, wherein the interface is configured to generate the at least one control signal based on at least one sensor signal from at least one sensor.

Clause 49: The method of any one of clauses 39-48, wherein the at least one sensor comprises at least one of a speed sensor, a location sensor, or a clock.

Clause 50: The method of any one of clauses 39-49, wherein the at least one control signal comprises at least one first control signal from the at least one sensor and at least one second signal from at least one of an operator interface, a HOT device, a PTC device, or an ETMS device, wherein changing the state of the indicator comprises overriding the at least one first control signal in response to the at least one second control signal.

Clause 51: The method of any one of clauses 39-50, wherein the interface is configured to display an indication of the state of the indicator.

Clause 52: The method of any one of clauses 39-51, wherein the at least one control signal comprises an interruption in an electrical signal.

Clause 53: The method of any one of clauses 39-52, wherein the at least one control signal comprises at least one of a digital signal or an analog signal.

Clause 54: The method of any one of clauses 39-53, wherein the communication interface comprises at least one of a wired interface or a wireless interface.

Clause 55: The method of any one of clauses 39-54, wherein the state comprises at least one of an off state or an on state.

Clause 56: The method of any one of clauses 39-55, wherein the state of the indicator comprises one of a plurality of possible states, each of the plurality of possible states associated with at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input.

Clause 57: The method of any one of clauses 39-56, further comprising a camera disposed proximate to the indicator, wherein the state is changed to an enhanced brightness state to illuminate at least part of a viewing area of the camera.

BRIEF DESCRIPTION OF THE DRAWINGS

Additional advantages and details of the disclosed subject matter are explained in greater detail below with reference to the exemplary embodiments that are illustrated in the accompanying schematic figures, in which:

FIG. 1 is a diagram of a non-limiting embodiment of an environment in which systems, devices, products, apparatuses, and/or methods, described herein, may be implemented according to the principles of the presently disclosed subject matter;

FIG. 2 is a diagram of a non-limiting embodiment of a rail vehicle system according to the principles of the presently disclosed subject matter;

FIG. 3 is a diagram of a non-limiting embodiment of components of one or more devices of FIG. 1 and FIG. 2 according to the principles of the presently disclosed subject matter; and

FIG. 4 is a flowchart of a non-limiting embodiment of a process for controlling an indicator on a rail vehicle according to the principles of the presently disclosed subject matter.

DETAILED DESCRIPTION

The following detailed description of non-limiting embodiments refers to the accompanying drawings. The same reference numbers in different drawings may identify the same or similar elements.

For purposes of the description hereinafter, the terms “end,” “upper,” “lower,” “right,” “left,” “vertical,” “horizontal,” “top,” “bottom,” “lateral,” “longitudinal,” and derivatives thereof shall relate to the disclose subject matter as it is oriented in the drawing figures. However, it is to be understood that the disclosed subject matter may assume various alternative variations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments or aspects of the disclosed subject matter. Hence, specific dimensions and other physical characteristics related to the embodiments or aspects of the embodiments disclosed herein are not to be considered as limiting unless otherwise indicated.

No aspect, component, element, structure, act, step, function, instruction, and/or the like used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and may be used interchangeably with “one or more” and “at least one.” Furthermore, as used herein, the term “set” is intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, etc.) and may be used interchangeably with “one or more” or “at least one.” Where only one item is intended, the term “one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based at least partially on” unless explicitly stated otherwise.

As used herein, the terms “communication” and “communicate” may refer to the reception, receipt, transmission, transfer, provision, and/or the like of information (e.g., data, signals, messages, instructions, commands, and/or the like). For one unit (e.g., a device, a system, a component of a device or system, combinations thereof, and/or the like) to be in communication with another unit means that the one unit is able to directly or indirectly receive information from and/or transmit information to the other unit. This may refer to a direct or indirect connection that is wired and/or wireless in nature. Additionally, two units may be in communication with each other even though the information transmitted may be modified, processed, relayed, and/or routed between the first and second unit. For example, a first unit may be in communication with a second unit even though the first unit passively receives information and does not actively transmit information to the second unit. As another example, a first unit may be in communication with a second unit if at least one intermediary unit (e.g., a third unit located between the first unit and the second unit) processes information received from the first unit and communicates the processed information to the second unit. In some non-limiting embodiments, a message may refer to a network packet (e.g., a data packet and/or the like) that includes data. It will be appreciated that numerous other arrangements are possible. It will be appreciated that numerous other arrangements are possible.

Non-limiting embodiments of the disclosed subject matter are directed to systems, devices, products, apparatuses, and/or methods for controlling an indicator at a rear car of a rail vehicle, including, but not limited to, controlling an indicator at a rear car of a rail vehicle based on a control signal from a lead car. For example, non-limiting embodiments of the disclosed subject matter provide an indicator (e.g., visual indicator such as a light source and/or the like) disposed with a rear car of a train, interfaces to communicate control signal(s), and a controller to control the indicator based on the control signal(s). Such embodiments provide techniques and systems for controlling an indicator (e.g., visual indicator) at the rear of the train. For example the operator of the train (e.g., at the front of the train), crew members, or other individuals or computer systems may directly or indirectly control the indicator. Additionally, such control may improve flexibility in using the indicator in certain conditions. For example, the indicator may be controlled in response to environmental conditions, hazardous conditions, type of cargo (e.g., hazardous cargo), time and location of the train, triggers from control systems, input from the operator, and/or the like. Additionally or alternatively, non-limiting embodiments of the disclosed subject matter provide an indicator (e.g., visual indicator such as a light source and/or the like) separate from a high visibility marker (HVM) of an end of train (EOT) device. Such embodiments provide techniques and systems which may further improve flexibility in using the indicator in certain conditions to make certain indication without modification of the HVM in contravention of applicable laws and/or regulations.

Referring now to FIG. 1, FIG. 1 is a diagram of a non-limiting embodiment of an environment 100 in which systems, devices, products, apparatuses, and/or methods, described herein, may be implemented. As shown in FIG. 1, environment 100 may include at least one input component 110 a, 110 b, 110 c; (front of train) interface 120; (rear of train) interface 130; high visibility marker (HVM) 135; an external indicator 140; and/or image capture device 145. Systems and/or devices of environment 100 may interconnect via wired connections, wireless connections, or a combination of wired and wireless connections. For example, systems and/or devices of environment 100 may interconnect via one or more wired and/or wireless networks, where the one or more wired and/or wireless networks may include a cellular network (e.g., a long-term evolution (LTE) network, a third generation (3G) network, a fourth generation (4G) network, a code division multiple access (CDMA) network, etc.), a public land mobile network (PLMN), a local area network (LAN), a wide area network (WAN), a metropolitan area network (MAN), a telephone network (e.g., the public switched telephone network (PSTN)), a private network, an ad hoc network, an intranet, the Internet, a fiber optic-based network, a cloud computing network, an Association of American Railroads (AAR) wireless communication system (e.g., AAR Wireless Communications Committee (WCC) standard and/or the like), and/or the like, and/or a combination of these or other types of networks.

As shown in FIG. 1, in some non-limiting embodiments, at least one indicator (e.g., HVM 135, external indicator 140, and/or the like) may be disposed with a rail vehicle. For example, the rail vehicle may be a train having at least one car. In some non-limiting embodiments, the indicator (e.g., HVM 135, external indicator 140, and/or the like) may be disposed with a rear car of the train. In some non-limiting embodiments, the indicator (e.g., HVM 135, external indicator 140, and/or the like) may include a visual indicator, e.g., a light source. For example, the light source may include at least one of an illumination fixture, a light emitting assembly, a light bulb, a light emitting diode, a laser, an infrared light source, an ultraviolet light source, a visible light source, and/or the like.

In some non-limiting embodiments, the indicator may include HVM 135. For example, HVM 135 may be integrated with and/or coupled to interface 130. Additionally or alternatively, interface 130 may include an end of train (EOT) device. In some non-limiting embodiments, interface 130 (e.g., EOT device) may be coupled to a trailing coupler of the rear car of a train. In some non-limiting embodiments, the indicator may include external indicator 140. For example, external indicator 140 may include a visual indicator (e.g., a light source) separate from HVM 135 of interface 130 (e.g., EOT device). In some non-limiting embodiments, external indicator 140 may be disposed proximate to a trailing end of the rear car. Additionally or alternatively, the external indicator 140 may be removably connected to interface 130 (e.g., EOT device).

In some non-limiting embodiments, interface 120 may be located at a first location (e.g., at a front of a rail vehicle, such as a lead locomotive or control car and/or the like). Additionally or alternatively, interface 130 may be located at a second location (e.g., at a rear of a rail vehicle, such as a rear car and/or the like) that is different than the first location. For example, interface 120 may be located within an operator compartment of a rail vehicle (e.g., at the front of the rail vehicle). Additionally or alternatively, interface 130 may be mounted on a different rail vehicle (e.g., a rear car of the rail vehicle and/or the like). In some non-limiting embodiments, interface 120 may be mounted on a rail vehicle and interface 130 may be mounted on the same rail vehicle. For example, interface 120 may be located in an operator compartment of a lead locomotive or control car and interface 130 may be on a trailing coupler of such lead locomotive or control car.

In some non-limiting embodiments, interface 120 may include an operator interface. Additionally or alternatively, interface 120 may include at least one of a head of train (HOT) device, a positive train control (PTC) device, or an electronic train management system (ETMS) device. In some non-limiting embodiments, interface 120 may be configured to receive inputs and/or control signals from a remote server (e.g., PTC server or ETMS server).

In some non-limiting embodiments, interface 120 may include and/or receive inputs from at least one input component 110 a, 110 b, 110 c, . . . , 110 n (not shown). For example, first input component 110 a may include one or more input components for user input (e.g., a touch screen display, a keyboard, a keypad, a mouse, a button, a switch, a microphone, etc.), such as from an operator and/or crew member of a rail vehicle. For example, interface 120 may receive at least one control signal from and/or generate at least one control signal based on first input component 110 a (e.g., PTC or ETMS).

As further shown in FIG. 1, in some non-limiting embodiments, environment 100 may include one or more additional input components/interfaces, such as second input component 110 b (e.g., PTC or ETMS), third input component 110 c (e.g., sensors, other authorized triggers, and/or the like), through nth input component 110 n (not shown). For example, interface 120 may receive at least one control signal from and/or generate at least one control signal based on second input component 110 b (e.g., PTC or ETMS). Additionally or alternatively, interface 120 may receive at least one control signal from and/or generate at least one control signal based on third input component 110 c (e.g., e.g., a sensor, an authorized trigger, and/or the like). In some non-limiting embodiments, third input component 110 c (e.g., a sensor) may include at least one of a speed sensor, a location sensor, a clock, any combination thereof, and/or the like.

In some non-limiting embodiments, interface 120 may receive at least one control signal from and/or generate at least one control signal based on conditions related to the rail vehicle. For example, interface 120 may receive at least one control signal from and/or generate at least one control signal based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a PTC, an ETMS, an authorized trigger, a sensor, a manual input, and/or the like.

In some non-limiting embodiments, interface 120 may display an indication of the state of the indicator (e.g., HVM 135, external indicator 140, and/or the like). For example, interface 120 may include a display screen, and a status of the indicator may be indicated by text and/or graphics in at least a portion of the display screen. Additionally or alternatively, interface 120 may include a visual indication of the status of the indicator (e.g., one or more lights, dials, and/or the like). Additionally or alternatively, interface 120 may indicate the state of the indicator in a non-visual manner, e.g., an audible indication (e.g., a noise, a tone, a chime, and/or the like from a speaker, a bell, and/or the like).

In some non-limiting embodiments, interface 120 may include a communication interface (e.g., wired or wireless communication interface). Additionally or alternatively, interface 130 may include a communication interface (e.g., wired or wireless communication interface). In some non-limiting embodiments, interface 120 may communicate with interface 130 via respective communication interfaces thereof. In some non-limiting embodiments, interface 120 (e.g., a communication interface of interface 120) may communicate directly with external indicator 140 (e.g., a communication interface of external indicator 140), image capture device 145 (e.g., a communication interface of image capture device 145), other components, devices, and/or systems of environment 100, and/or the like independent of interface 130.

In some non-limiting embodiments, the control signal(s) may include at least one first control signal from third input component 110 c (e.g., at least one sensor and/or the like) and at least one second signal from at least one of first input component 110 a (e.g., an operator interface, an HOT device, and/or the like) and/or second input component 110 b (e.g., a PTC device, an ETMS device, and/or the like). Additionally or alternatively, such first control signal(s) may be overridden in response to the second control signal(s).

In some non-limiting embodiments, the control signal(s) may include at least one digital signal. For example, a digital signal may include at least one of a message (e.g., packet, frame, and/or the like of data, information, and/or the like), a code word, a bit, a sequence of bits, a bit stream, and/or the like. Additionally or alternatively, the control signal(s) may include an analog signal (e.g., an electrical signal, an electromagnetic signal, and/or the like). In some non-limiting embodiments, the control signal(s) may include an interruption in a digital or analog signal (e.g., a temporary or permanent disconnection, a modulation, and/or the like).

In some non-limiting embodiments, an indicator (e.g., HVM 135, external indicator 140, and/or the like) may be controlled by a controller. For example, the controller may be integrated with interface 130 (e.g., an EOT device, and/or the like). Additionally or alternatively, the controller may be integrated with interface 120 (e.g., an HOT device, an operator interface, a PTC, an ETMS, and/or the like). Additionally or alternatively, the controller may be at least partially separate from and independent of interface 120 and interface 130. In some non-limiting embodiments, the controller may be configured to change a state of the indicator based on control signals (e.g., from interface 120, interface 130, remote servers (such as PTC or ETMS servers), and/or the like). Additionally or alternatively, if multiple control signals are received at the controller, the controller may be configured to override at least one first control signal (e.g., from third input component 110 c) in response to at least one second control signal (e.g., from first input component 110 a and/or second input component 110 b), as described herein.

In some non-limiting embodiments, the state of the indicator (e.g., HVM 135, external indicator 140, and/or the like) may include at least one of an off state or an on state. For example, the indicator (e.g., HVM 135, external indicator 140, and/or the like) may be a light source, and an off state may be associated with the light source not radiating any light. Additionally or alternatively, an on state may be associated with the light source radiating light. In some non-limiting embodiments, the state of the indicator (e.g., HVM 135, external indicator 140, and/or the like) may include a brightness level. For example, the indicator (e.g., HVM 135, external indicator 140, and/or the like) may have multiple possible levels of brightness (e.g., when in the on state). In some non-limiting embodiments, the brightness levels may include a first (e.g., lowest, default, and/or the like) brightness state and at least one second (e.g., enhanced) brightness state brighter than the first brightness state. In some non-limiting embodiments, the indicator (e.g., HVM 135, external indicator 140, and/or the like) may include a plurality of possible states, each of the plurality of possible states associated with at least one condition associated with the rail vehicle (e.g., an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input). For example, each of the possible states may include a different number of lights on the indicator (e.g., HVM 135, external indicator 140, and/or the like), a different color or combination of colors of lights on the indicator, a different pattern of flashing of the lights of the indicator, and/or the like.

In some non-limiting embodiments, environment 100 may include image capture device 145. For example, illumination for image capture device 145 may be provided by the indicator (e.g., at least one of HVM 135 or external indicator 140), e.g., by turning on the indicator and/or changing a state of the indicator to an enhanced brightness state sufficient to illuminate at least part of a view area of image capture device 145. In some non-limiting embodiments, image capture device 145 may be interconnected with interface 130 (e.g., at a rear of a train). Additionally or alternatively, image capture device 145 may be interconnected, directly or indirectly (e.g., via interface 130), to interface 120 (e.g., at a front of a train). In some non-limiting embodiments, image capture device 145 includes one or more devices capable of detecting an image (e.g., image data associated with an image of one or more tracks, image data associated with an image of a set of parallel tracks, etc.), capturing image data associated with the image, and/or communicating the image data that is captured (e.g., communicating the image data to interface 120 and/or interface 130). For example, image capture device 145 may include an image sensor, a device that includes an image sensor, a camera (e.g., a digital camera, an infrared camera, an ultraviolet camera, etc.), a video recorder, a video camera, and/or the like.

In some non-limiting embodiments, interface 120 may display an image and/or video captured by image capture device 145. For example, interface 120 may include a display screen, and the image and/or video captured by image capture device 145 may be displayed in at least a portion of the display screen.

The number and arrangement of systems shown in FIG. 1 are provided as an example. There may be additional systems, devices and/or networks, fewer systems, devices, and/or networks, different systems, devices and/or networks, or differently arranged systems, devices, and/or networks than those shown in FIG. 1. Furthermore, two or more systems or devices shown in FIG. 1 may be implemented within a single system or a single device, or a single system or a single device shown in FIG. 1 may be implemented as multiple, distributed systems or devices. Additionally or alternatively, a set of systems or a set of devices (e.g., one or more systems, one or more devices) of environment 100 perform one or more functions described as being performed by another set of systems or another set of devices of environment 100.

Referring now to FIG. 2, FIG. 2 is a diagram of a non-limiting embodiment of a rail vehicle system 200 for controlling an indicator. As shown in FIG. 2, a first rail vehicle 201 (e.g., front car of a rail vehicle, such as a locomotive or control car) may include first interface 220 (e.g., HOT, PTC, ETMS, operator interface, and/or the like). In some non-limiting embodiments, first interface 220 may be the same as, or similar to, interface 120. First interface 220 may include at least one input component, e.g., first input component 210 a (e.g., operator input and/or the like), second input component 210 b (e.g., PTC input, ETMS input, and/or the like), third input component 210 c (e.g., sensors, other authorized triggers, and/or the like), and/or the like. In some non-limiting embodiments, first input component 210 a, second input component 210 b, and third input component 210 c may be the same as, or similar to, first input component 110 a, second input component 110 b, and third input component 110 c, respectively. Additionally or alternatively, interface 220 may include memory 226 and control system 224. In some non-limiting embodiments, control system 224 and/or memory 226 may be the same as, or similar to, at least part of a controller of an indicator (e.g., HVM 235, external indicator 240, and/or the like), as described herein. In some non-limiting embodiments, first interface 220 may further include first communication interface 222 (e.g., a wired or wireless transceiver). In some non-limiting embodiments, first communication interface 222 may be the same as, or similar to, the communication interface of interface 120.

As further shown in FIG. 2, a second rail vehicle 202 (e.g., rear car of a rail vehicle) may include second interface 230 (e.g., EOT device and/or the like). In some non-limiting embodiments, second interface 230 may be the same as or similar to interface 130. In some non-limiting embodiments, second interface 230 (e.g., EOT device and/or the like) may include HVM 235. In some non-limiting embodiments, HVM 235 may be the same as or similar to HVM 135. Additionally or alternatively, second rail vehicle 202 may include external indicator 240. In some non-limiting embodiments, external indicator 240 may be the same as or similar to external indicator 140. In some non-limiting embodiments, external indicator may be coupled to, in communication with, and/or removably connected to second interface 230 (e.g., EOT device and/or the like).

In some non-limiting embodiments, second rail vehicle 202 may include image capture device 245. In some non-limiting embodiments, image capture device 245 may be the same as or similar to image capture device 145. Additionally or alternatively, interface 220 may include memory 236 and control system 234. In some non-limiting embodiments, control system 234 and/or memory 236 may be the same as, or similar to, at least part of a controller of an indicator (e.g., HVM 235, external indicator 240, and/or the like), as described herein. In some non-limiting embodiments, second interface 230 may further include second communication interface 232 (e.g., a wired or wireless transceiver). In some non-limiting embodiments, second communication interface 232 may be the same as or similar to the communication interface of interface 130.

In some non-limiting embodiments, second interface 230 may be mounted on a trailing coupler of the last rail vehicle in a rail vehicle system (e.g., a plurality of rail vehicles connected together, a train, a train of cars, etc.) and second interface 230 may be equipped with at least one device (e.g., sensor) for monitoring the pressure of a brake system of the rail vehicle system and/or a telemetry device. For example, second interface 230 may include pressure transducer 238 that is connected to air brake coupling 239 and control system 234.

In some non-limiting embodiments, control system 234 and/or control system 224 may receive telemetry information (e.g., position information, GPS position information, etc.). For example, such telemetry information may be received via second input component 210 b (e.g., PTC device, ETMS device, and/or the like) or third input component 210 (e.g., sensors, other authorized triggers, and/or the like). Additionally or alternatively, such telemetry information may be associated with a rail vehicle (e.g., a train). In some non-limiting embodiments, control system 234 and/or control system 224 may affect the operation of the rail vehicle based on the telemetry information. For example, control system 234 and/or control system 224 may cause a brake system of the rail vehicle to be activated based on the telemetry information.

In some non-limiting embodiments, air brake coupling 239 may mechanically couple a rail vehicle that includes first interface 220 to second interface 230. In some non-limiting embodiments, air brake coupling 239 may be used by first interface 220 and/or second interface 230 to verify (e.g., based on a physical connection) that first interface 220 and/or second interface 230 is properly linked for communication between first interface 220 and/or second interface 230. In some non-limiting embodiments, an operator (e.g., a locomotive engineer) may control the air brakes of a rail vehicle (e.g., a rail vehicle of a rail vehicle system, such as a train) via engineer air brake control 231 and air brake coupling 239, which may extend the length of a rail vehicle system. In some non-limiting embodiments, control system 234 may control the air brakes of a rail vehicle in an emergency situation via emergency brake control unit 237.

In some non-limiting embodiments, second interface 230 may communicate with (e.g., send information to and receive information from) first interface 220 and vice versa via a communication link (e.g., a short range communication link) between first communication interface 222 (e.g., first transceiver) and second communication interface 232 (e.g., second transceiver). For example, second interface 230 may communicate position information relating to a position of a rail vehicle (e.g., position information relating to a position of a rail vehicle derived from a Global Positioning System (GPS) receiver of the rail vehicle) to first interface 220 via the communication link between first communication interface 222 (e.g., first transceiver) and second communication interface 232 (e.g., second transceiver). In some non-limiting embodiments, the communication link may operate with a bandwidth of 450 Mhz. The way in which second interface 230 may communicate with first interface 220 and vice versa, as well as control systems described above, are described in more detail in U.S. patent application Ser. No. 07/313,877, filed Feb. 23, 1989, which is assigned to the same assignee as this application and is incorporated herein by reference.

In some non-limiting embodiments, control system 234 and/or control system 224 may receive control signals associated with at least one input component 210 a, 210 b, 210 c, as described herein. For example, control system 234 may receive at least one input and/or control signal associated with at least one input component 210 a, 210 b, 210 c. Additionally or alternatively, control system 234 may generate at least one control signal(s) based on the input(s). In some non-limiting embodiments, control system 234 may communicate the control signal(s) via first communication interface 222 to second communication interface 232. Additionally or alternatively, second communication interface 232 may receive the control signal(s). In some non-limiting embodiments, the control signal(s) may be generated based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a PTC, an ETMS, an authorized trigger, a manual input, and/or the like, as described herein.

In some non-limiting embodiments, control system 234 and/or control system 224 may change the state of an indicator (e.g., HVM 235, external indicator 240, and/or the like) based on the control signal(s), as described herein. For example, control system 234 may receive the control signals via the second communication interface 234 coupled thereto. Additionally or alternatively, control system 234 may be coupled to the indicator (e.g., HVM 235, external indicator 240, and/or the like). Additionally or alternatively, control system 234 may change a state (e.g., on, off, first brightness, second/enhanced brightness, one of a plurality of different states, and/or the like) of the indicator (e.g., HVM 235, external indicator 240, and/or the like), as described herein.

Referring now to FIG. 3, FIG. 3 is a diagram of example components of a device 300. Device 300 corresponds to one or more devices of environment 100 (e.g., input components 110 a, 110 b, 110 c, interface 120, interface 130, HVM 135, external indicator 140, and/or image capture device 145) and/or one or more devices of system 200 (e.g., first interface 220, input components 210 a, 210 b, 210 c, control system 224, memory 226, first communication interface 222, second interface 230, control system 234, memory 236, emergency brake control unit 237, pressure transducer 238, air brake coupling 239, engineer air brake control 231, HVM 235, external indicator 240, image capture device 245, and/or second communication interface 232). In some non-limiting embodiments, one or more devices of environment 100 and/or system 200 may include at least one device 300 and/or at least one component of device 300. As shown in FIG. 3, device 300 may include bus 302, processor 304, memory 306, storage component 308, input component 310, output component 312, and communication interface 314.

Bus 302 may include a component that permits communication among the components of device 300. In some non-limiting embodiments, processor 304 may be implemented in hardware, firmware, software, or any combination thereof. For example, processor 304 may include a processor (e.g., a central processing unit (CPU), a graphics processing unit (GPU), an accelerated processing unit (APU), etc.), a microprocessor, a digital signal processor (DSP), and/or any processing component (e.g., a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), etc.) that can be programmed to perform a function. Memory 306 may include a random access memory (RAM), a read-only memory (ROM), and/or another type of dynamic or static storage device (e.g., flash memory, magnetic memory, optical memory, etc.) that stores information and/or instructions for use by processor 304.

Storage component 308 may store information and/or software related to the operation and use of device 300. For example, storage component 308 may include a hard disk (e.g., a magnetic disk, an optical disk, a magneto-optic disk, a solid state disk, etc.), a flash memory, a compact disc (CD), a digital versatile disc (DVD), a floppy disk, a cartridge, a magnetic tape, and/or another type of computer-readable medium, along with a corresponding drive.

Input component 310 may include a component that permits device 300 to receive information, such as via user input (e.g., a touch screen display, a keyboard, a keypad, a mouse, a button, a switch, a microphone, etc.). Additionally or alternatively, input component 310 may include a sensor for sensing information (e.g., a GPS component, an accelerometer, a gyroscope, an actuator, a light sensor, a barometer, a thermometer, a speed sensor (e.g., speedometer), a clock, etc.). Output component 312 may include a component that provides output information from device 300 (e.g., a display, a speaker, one or more light-emitting diodes (LEDs), etc.).

Communication interface 314 includes a transceiver-like component (e.g., a transceiver, a separate receiver and transmitter, etc.) that enables device 300 to communicate with other devices, such as via a wired connection, a wireless connection, or a combination of wired and wireless connections. Communication interface 314 permits device 300 to receive information from another device and/or provide information to another device. For example, communication interface 314 may include an Ethernet interface, an optical interface, a coaxial interface, an infrared interface, a radio frequency (RF) interface, a universal serial bus (USB) interface, a Wi-Fi interface, a cellular network interface, and/or the like.

In some non-limiting embodiments, device 300 performs one or more processes described herein. In some non-limiting embodiments, device 300 performs these processes based on processor 304 executing software instructions stored by a computer-readable medium, such as memory 306 and/or storage component 308. A computer-readable medium (e.g., a non-transitory computer-readable medium) is defined herein as a non-transitory memory device. A memory device includes memory space located inside of a single physical storage device or memory space spread across multiple physical storage devices.

Software instructions are read into memory 306 and/or storage component 308 from another computer-readable medium or from another device via communication interface 314. When executed, software instructions stored in memory 306 and/or storage component 308 cause processor 304 to perform one or more processes described herein. Additionally or alternatively, hardwired circuitry may be used in place of or in combination with software instructions to perform one or more processes described herein. Thus, embodiments described herein are not limited to any specific combination of hardware circuitry and software.

The number and arrangement of components shown in FIG. 3 are provided as an example. In some non-limiting embodiments, device 300 includes additional components, fewer components, different components, or differently arranged components than those shown in FIG. 3. Additionally or alternatively, a set of components (e.g., one or more components) of device 300 performs one or more functions described as being performed by another set of components of device 300.

Referring now to FIG. 4, FIG. 4 is a flowchart of a non-limiting embodiment of a process 400 for controlling an indicator. In some non-limiting embodiments, one or more of the steps of process 400 may be performed (e.g., completely, partially, etc.) by interface 130 and/or second interface 230 (e.g., one or more components or devices of interface 130 and/or second interface 230). In some non-limiting embodiments, one or more of the steps of process 400 may be performed (e.g., completely, partially, etc.) by another device or a group of devices separate from or including interface 130 and/or second interface 230, such as interface 120 and/or first interface 220, (e.g., one or more components or devices of interface 120 and/or first interface 220), HVM 135 and/or HVM 235, external indicator 140 and/or external indicator 240, one or more components or devices of environment 100, one or more components or devices of system 200, and/or the like.

As shown in FIG. 4, at step 402, process 400 may include providing at least one control signal. For example, an interface proximate to a front of a rail vehicle (e.g., interface 120 and/or first interface 220) may receive the control signal(s) from and/or generate the control signal(s) based on inputs (e.g., input components 110 a, 110 b, 110 c, input components 210 a, 210 b, 210 c, and/or a remote server (e.g., PTC server, ETMS server, and/or the like)), as described herein. In some non-limiting embodiments, the control signal(s) may be based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a PTC, an ETMS, an authorized trigger, a manual input, and/or the like, as described herein. Additionally or alternatively, an interface proximate to a rear of the rail vehicle (e.g., interface 130 and/or second interface 220) may receive the control signal(s) from and/or generate the control signal(s) based on inputs (e.g., input components 110 a, 110 b, 110 c, input components 210 a, 210 b, 210 c, and/or a remote server (e.g., PTC server, ETMS server, and/or the like)), as described herein.

In some non-limiting embodiments, the interface proximate to the front of the rail vehicle (e.g., interface 120 and/or first interface 220) may include at least one of an operator interface, a HOT device, a PTC device, an ETMS device, and/or the like, as described herein. Additionally or alternatively, inputs (e.g., input components 110 a, 110 b, 110 c and/or input components 210 a, 210 b, 210 c) may be at least one of operator input, PTC input, ETMS input, sensor input, other authorized triggers, and/or the like, as described herein.

In some non-limiting embodiments, the control signal(s) may include at least one of a digital signal, an analog signal, and/or the like, as described herein. Additionally or alternatively, the control signal(s) may include an interruption in an electrical signal, as described herein.

As further shown in FIG. 4, at step 404, process 400 may include transmitting the control signal(s). For example, the interface proximate to the front of the rail vehicle (e.g., interface 120 and/or first interface 220) may transmit the control signal(s) via a communication interface (e.g., first communication interface 222), as described herein. Additionally or alternatively, inputs (e.g., input components 110 a, 110 b, 110 c, input components 210 a, 210 b, 210 c, and/or a remote server (e.g., PTC server, ETMS server, and/or the like)) may transmit the control signals directly to the interface proximate to the rear of the rail vehicle (e.g., interface 130 and/or second interface 230), as described herein.

As further shown in FIG. 4, at step 406, process 400 may include receiving the control signal(s). For example, the interface proximate to the rear of the rail vehicle (e.g., interface 130 and/or second interface 230) may receive via a communication interface (e.g., second communication interface 232) the control signal(s) transmitted from a communication interface (e.g., first communication interface 222) of the interface proximate to the front of the rail vehicle (e.g., interface 120 and/or first interface 220), as described herein. Additionally or alternatively, the interface proximate to the rear of the rail vehicle (e.g., interface 130 and/or second interface 230) may receive the control signal(s) from inputs (e.g., input components 110 a, 110 b, 110 c, input components 210 a, 210 b, 210 c, and/or a remote server (e.g., PTC server, ETMS server, and/or the like)), as described herein.

As further shown in FIG. 4, at step 408, process 400 may include changing a state of the indicator based on the control signal(s). For example, a state of the indicator (e.g., HVM 135, HVM 235, external indicator 140, and/or external indicator 240) may be changed by a controller (e.g., interface 130, second interface 230, control system 234, and/or the like) based on the control signal(s), as described herein.

In some non-limiting embodiments, the indicator (e.g., HVM 135, HVM 235, external indicator 140, and/or external indicator 240) may include a light source, as described herein. For example, the light source may include at least one of an illumination fixture, a light emitting assembly, a light bulb, a light emitting diode, a laser, an infrared light source, an ultraviolet light source, a visible light source, and/or the like, as described herein.

In some non-limiting embodiments, the indicator may include an HVM (e.g., HVM 135 and/or HVM 235) of the interface proximate to the rear of the rail vehicle (e.g., interface 130 (e.g., an EOT device) and/or second interface 230 (e.g., an EOT device), respectively), as described herein. In some non-limiting embodiments, the indicator may include an indicator/light source (e.g., external indicator 140 and/or external indicator 240) separate from the HVM (e.g., HVM 135 and/or HVM 235), as described herein. In some non-limiting embodiments, an indicator (e.g., external indicator 140 and/or external indicator 240) may be removably connected to the interface proximate to the rear of the rail vehicle (e.g., interface 130 and/or second interface 230, respectively), as described herein.

In some non-limiting embodiments, the indicator (e.g., HVM 135, HVM 235, external indicator 140, and/or external indicator 240) may be disposed proximate to a trailing end of the rear car.

In some non-limiting embodiments, at least one first control signal (e.g., a sensor or other authorized trigger control signal from third input component 110 c and/or third input component 210 c) may be overridden in response to at least one second control signal (e.g., an operator control signal from first input component 110 a and/or first input component 210 a, a PTC/ETMS control signal from second input component 110 b and/or second input component 210 b, and/or the like), as described herein.

In some non-limiting embodiments, the state of the indicator (e.g., HVM 135, HVM 235, external indicator 140, and/or external indicator 240) may be one of on, off, first/default brightness, second/enhanced brightness, one of a plurality of different states, and/or the like, as described herein. In some non-limiting embodiments, the interface proximate to the front of the rail vehicle (e.g., interface 120 and/or first interface 220) may display an indication of the state of the indicator (e.g., HVM 135, HVM 235, external indicator 140, and/or external indicator 240), as described herein. In some non-limiting embodiments, an image capture device (e.g., image capture device 145 and/or image capture device 245) may be disposed proximate to the indicator (e.g., HVM 135, HVM 235, external indicator 140, and/or external indicator 240), and the state of the indicator may be changed to an on state and/or an enhanced brightness state to illuminate at least part of a viewing area of the image capture device (e.g., image capture device 145 and/or image capture device 245), as described herein. Additionally or alternatively, the interface proximate to the front of the rail vehicle (e.g., interface 120 and/or first interface 220) may display an image and/or video captured by the image capture device (e.g., image capture device 145 and/or image capture device 245), as described herein.

In some non-limiting embodiments, an EOT device may turn on an HVM when light conditions reach a certain threshold for a certain amount of time, and such functionality may be autonomous to the EOT device. Allowing an HOT device to command/control the HVM and/or other lights/indicators (e.g., external indictor) may increase control over the EOT device/HVM and add flexibility to the system for future applications. For example, a light/indicator may be either built into the EOT device (e.g., the same as or separate from the HVM) and/or coupled to/removably plugged into the EOT device. Additionally or alternatively, such a light/indicator may have its own set of functions, including various patterns and/or apertures (e.g., brightness levels). In some non-limiting embodiments, an indicator (e.g., HVM or external indicator) may be turned on/off and/or change state based on time of day and location (e.g., to the HOT device), based on when a light sensor fails (e.g., because the rail vehicle stopped in location where overwhelming light is pointed at the EOT device and HVM is extinguished or because the light sensor breaks/fails for other reasons, which may be known to the HOT device). Additionally or alternatively, an indicator (e.g., HVM or external indicator) may be turned on/off and/or change state when required by local regulations (e.g., which may change over time), even if light conditions exceed the threshold (e.g., harsh weather conditions during daylight, cargo type, and/or the like). Additionally or alternatively, an indicator (e.g, HVM or external indicator) may be turned on/off and/or change state based on emergency situations and/or to provide/increase illuminating light in any light condition. Additionally or alternatively, an indicator (e.g., HVM or external indicator) may be used as a light source for image/video capture. Additionally or alternatively, timing of a flash of an indicator (e.g., HVM or external indicator) may be synchronized/shifted to coordinate with image/video capture, e.g., to reduce artifacts created by the indicator (e.g., HVM or external indicator) flashing out of sync with the image/video capture device. Additionally or alternatively, PTC input for indication of conditions related to a rail vehicle (e.g., the rail vehicle slowing down, going into emergency conditions, entering risky conditions within a certain distance (e.g., a number of miles, such as 2 miles), and/or the like) may be relayed to the indicator (e.g., HVM or external indicator). Additionally or alternatively, laser pointer control may be enabled.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the implementations to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the implementations.

It will be apparent that systems and/or methods, described herein, may be implemented in different forms of hardware, firmware, software, or any combination thereof. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the implementations. Thus, the operation and behavior of the systems and/or methods were described herein without reference to specific software code—it being understood that software and hardware can be designed to implement the systems and/or methods based on the description herein.

Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of possible implementations. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of possible implementations includes each dependent claim in combination with every other claim in the claim set. 

1. A device for attachment to a train having a lead locomotive or control car and a rear car, comprising: a light source disposed with the rear car; a communication interface configured to receive at least one control signal from an interface onboard the lead locomotive or control car, wherein the at least one control signal is generated based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input; and a controller coupled to the light source and the communication interface, the controller configured to change a state of the light source based on the at least one control signal.
 2. (canceled)
 3. The device of claim 1, wherein the light source comprises at least one of an illumination fixture, a light emitting assembly, a light bulb, a light emitting diode, a laser, an infrared light source, an ultraviolet light source, or a visible light source.
 4. The device of claim 1, wherein the light source comprises a high visibility marker (HVM) of an end of train (EOT) device.
 5. The device of claim 1, wherein the light source is separate from a high visibility marker (HVM) of an end of train (EOT) device coupled to a trailing coupler of the rear car.
 6. The device of claim 5, wherein the light source is removably connected to the EOT device.
 7. The device of claim 1, wherein the light source is disposed proximate to a trailing end of the rear car.
 8. The device of claim 1, wherein the interface onboard the lead locomotive or control car comprises at least one of an operator interface, a head of train (HOT) device, a PTC device, or an ETMS device.
 9. The device of claim 1, wherein the interface onboard the lead locomotive or control car is configured to receive the at least one control signal from a remote server.
 10. The device of claim 1, wherein the interface onboard the lead locomotive or control car is configured to generate the at least one control signal based on at least one sensor signal from at least one sensor.
 11. The device of claim 10, wherein the at least one sensor comprises at least one of a speed sensor, a location sensor, or a clock.
 12. The device of claim 10, wherein the at least one control signal comprises at least one first control signal from the at least one sensor and at least one second signal from at least one of an operator interface, a head of train (HOT) device, a PTC device, or an ETMS device, wherein the controller is configured to override the at least one first control signal in response to the at least one second control signal.
 13. The device of claim 1, wherein the interface onboard the lead locomotive or control car is configured to display an indication of the state of the light source.
 14. The device of claim 1, wherein the at least one control signal comprises an interruption in an electrical signal.
 15. The device of claim 1, wherein the at least one control signal comprises at least one of a digital signal or an analog signal.
 16. The device of claim 1, wherein the communication interface comprises at least one of a wired interface or a wireless interface.
 17. The device of claim 1, wherein the state comprises at least one of an off state or an on state.
 18. The device of claim 1, wherein the state of the light source comprises one of a plurality of possible states, each of the plurality of possible states associated with at least one of the environmental condition, the hazardous condition, the type of cargo associated with the train, the time and location of the train, the PTC, the ETMS, the authorized trigger, or the manual input.
 19. The device of claim 1, further comprising a camera disposed proximate to the light source, wherein the state is changed to an enhanced brightness state to illuminate at least part of a viewing area of the camera.
 20. A light source control system for a train having a lead locomotive or control car and a rear car, comprising: an interface onboard the at least one locomotive or control car, the interface configured to transmit at least one control signal based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input; a device for attachment to the train, the device comprising: a light source disposed with the rear car; and a controller coupled to the light source, the controller configured to receive the at least one control signal from the interface and to change a state of the light source based on the at least one control signal.
 21. A method for light source control for a train having a lead locomotive or control car and a rear car, comprising: transmitting at least one control signal based on at least one of an environmental condition, a hazardous condition, a type of cargo associated with the train, a time and location of the train, a positive train control (PTC), an electronic train management system (ETMS), an authorized trigger, or a manual input; receiving the at least one control signal at a device attached to the train, wherein the device comprises a light source disposed with the rear car; and changing a state of the light source of the device based on the at least one control signal. 